A re-evaluation of species limits in Canadian Arctic Island Puccinellia (Poaceae): resolving key characters
This study examined morphological variation for species of Puccinellia that have traditionally posed problems of identification in the Canadian Arctic Archipelago. The first part of the study involved a re-examination of several characters that were difficult to define or describe. Microscopic exami...
Published in: | Canadian Journal of Botany |
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Canadian Science Publishing
2001
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Online Access: | http://dx.doi.org/10.1139/b01-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/b01-065 |
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crcansciencepubl:10.1139/b01-065 2024-06-09T07:42:41+00:00 A re-evaluation of species limits in Canadian Arctic Island Puccinellia (Poaceae): resolving key characters Consaul, L L Gillespie, L J 2001 http://dx.doi.org/10.1139/b01-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/b01-065 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 79, issue 8, page 927-956 ISSN 0008-4026 journal-article 2001 crcansciencepubl https://doi.org/10.1139/b01-065 2024-05-16T13:27:33Z This study examined morphological variation for species of Puccinellia that have traditionally posed problems of identification in the Canadian Arctic Archipelago. The first part of the study involved a re-examination of several characters that were difficult to define or describe. Microscopic examination of lemma and glume apices revealed that the characters "erose-ciliolate" lemma and glume apex margins are more accurately divided into two characters: degree to which they are erose, and presence of trichomes. These trichomes consist of acute or acuminate cells that protrude 1535 µm from the margin, sometimes with a spinulose tip up to 10 µm long. The term "thickened pedicel" is clarified to mean thickened below the apex in relation to the apex. The second part of the study involved preliminary morphometric analyses on the above-mentioned revised characters, plus other characters previously shown to have low plasticity in this genus, for 10 recognized species that are difficult to distinguish. Many species or species complexes resolved to a small degree, but no taxa formed distinct groups. Correlations among many characters were low, accounting for a low percentage of variation explained by the first few principal components. Hypotheses of species boundaries and a preliminary revised key to species and species groups, incorporating findings from this study, are presented.Key words: Puccinellia, Canadian Arctic, morphology, trichomes, principal components analysis, cluster analysis. Article in Journal/Newspaper Arctic Archipelago Arctic Canadian Arctic Archipelago Canadian Science Publishing Arctic Canadian Arctic Archipelago Arctic Island ENVELOPE(-74.766,-74.766,62.234,62.234) Lemma ENVELOPE(19.530,19.530,69.873,69.873) Canadian Journal of Botany 79 8 927 956 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
This study examined morphological variation for species of Puccinellia that have traditionally posed problems of identification in the Canadian Arctic Archipelago. The first part of the study involved a re-examination of several characters that were difficult to define or describe. Microscopic examination of lemma and glume apices revealed that the characters "erose-ciliolate" lemma and glume apex margins are more accurately divided into two characters: degree to which they are erose, and presence of trichomes. These trichomes consist of acute or acuminate cells that protrude 1535 µm from the margin, sometimes with a spinulose tip up to 10 µm long. The term "thickened pedicel" is clarified to mean thickened below the apex in relation to the apex. The second part of the study involved preliminary morphometric analyses on the above-mentioned revised characters, plus other characters previously shown to have low plasticity in this genus, for 10 recognized species that are difficult to distinguish. Many species or species complexes resolved to a small degree, but no taxa formed distinct groups. Correlations among many characters were low, accounting for a low percentage of variation explained by the first few principal components. Hypotheses of species boundaries and a preliminary revised key to species and species groups, incorporating findings from this study, are presented.Key words: Puccinellia, Canadian Arctic, morphology, trichomes, principal components analysis, cluster analysis. |
format |
Article in Journal/Newspaper |
author |
Consaul, L L Gillespie, L J |
spellingShingle |
Consaul, L L Gillespie, L J A re-evaluation of species limits in Canadian Arctic Island Puccinellia (Poaceae): resolving key characters |
author_facet |
Consaul, L L Gillespie, L J |
author_sort |
Consaul, L L |
title |
A re-evaluation of species limits in Canadian Arctic Island Puccinellia (Poaceae): resolving key characters |
title_short |
A re-evaluation of species limits in Canadian Arctic Island Puccinellia (Poaceae): resolving key characters |
title_full |
A re-evaluation of species limits in Canadian Arctic Island Puccinellia (Poaceae): resolving key characters |
title_fullStr |
A re-evaluation of species limits in Canadian Arctic Island Puccinellia (Poaceae): resolving key characters |
title_full_unstemmed |
A re-evaluation of species limits in Canadian Arctic Island Puccinellia (Poaceae): resolving key characters |
title_sort |
re-evaluation of species limits in canadian arctic island puccinellia (poaceae): resolving key characters |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/b01-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/b01-065 |
long_lat |
ENVELOPE(-74.766,-74.766,62.234,62.234) ENVELOPE(19.530,19.530,69.873,69.873) |
geographic |
Arctic Canadian Arctic Archipelago Arctic Island Lemma |
geographic_facet |
Arctic Canadian Arctic Archipelago Arctic Island Lemma |
genre |
Arctic Archipelago Arctic Canadian Arctic Archipelago |
genre_facet |
Arctic Archipelago Arctic Canadian Arctic Archipelago |
op_source |
Canadian Journal of Botany volume 79, issue 8, page 927-956 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b01-065 |
container_title |
Canadian Journal of Botany |
container_volume |
79 |
container_issue |
8 |
container_start_page |
927 |
op_container_end_page |
956 |
_version_ |
1801371427208691712 |